我国是塑料产品生产大国,塑料产品的使用产生了大量难以降解的塑料垃圾。为了能获得可高效降解塑料的菌株,本研究以聚乙烯塑料为唯一碳源,筛选出塑料降解菌,通过失重法测定其降解效率,采用16S rDNA序列测定对其进行核酸分类学鉴定。结果...我国是塑料产品生产大国,塑料产品的使用产生了大量难以降解的塑料垃圾。为了能获得可高效降解塑料的菌株,本研究以聚乙烯塑料为唯一碳源,筛选出塑料降解菌,通过失重法测定其降解效率,采用16S rDNA序列测定对其进行核酸分类学鉴定。结果:从半降解带土塑料中筛选出9株塑料降解菌,塑料降解菌的降解率为0.33%~4.24%。9株塑料降解菌中,6株为恶臭假单胞菌(Pseudomonas putida),3株为产吲哚金黄杆菌(Chryseobacterium indologenes),恶臭假单胞菌的塑料降解率高于产吲哚金黄杆菌,有进一步开发应用的潜力。China is a major producer of plastic in the world, while the use of plastic products creates a large amount of plastic waste which is difficult to be degraded. In order to obtain strains that can efficiently degrade plastics, polyethylene plastic was used as the sole carbon source to screen plastic degrading bacteria. The degradation efficiency was determined by weight-loss method, and the strains were identified by nucleic acid taxonomy based on 16S rDNA sequencing. Results: 9 plastic degrading bacteria were screened from semi degraded soil plastics, with the degradation rate of 0.33% to 4.24%. Among the 9 strains of plastic degrading bacteria, two-thirds are Pseudomonas putida and one-thirds are Chryseobacterium indologenes. The plastic degradation rate of P. putida is higher than that of C. indologenes. That indicates P. putida has the potential for further development and application.展开更多
针对单端四端浮地零器(FTFN:Four-Term inal F loating Nu llor)具有不适合应用于模数混合电路的缺点,提出了一种全平衡式四端浮地零器(FBFTFN:Fu lly Balanced Four-Term inal F loating Nu llor)及CMOS(Comp le-m entaryM etal-Oxide ...针对单端四端浮地零器(FTFN:Four-Term inal F loating Nu llor)具有不适合应用于模数混合电路的缺点,提出了一种全平衡式四端浮地零器(FBFTFN:Fu lly Balanced Four-Term inal F loating Nu llor)及CMOS(Comp le-m entaryM etal-Oxide Sem iconductor)电路实现。FBFTFN采用全平衡式结构,比单端FTFN通用性更强,应用更灵活;运用FBFTFN实现了电流模式连续时间五阶跳耦结构的滤波器。该滤波器采用5个有源元件数目,结构简单,所有电容,电阻都接地,适于全集成和模数混合电路。通过面向设计电路完成MOS管级的PSPICE(Personal S imu lation Program w ith Integrated)仿真,结果表明设计方案是可行的。展开更多
文摘我国是塑料产品生产大国,塑料产品的使用产生了大量难以降解的塑料垃圾。为了能获得可高效降解塑料的菌株,本研究以聚乙烯塑料为唯一碳源,筛选出塑料降解菌,通过失重法测定其降解效率,采用16S rDNA序列测定对其进行核酸分类学鉴定。结果:从半降解带土塑料中筛选出9株塑料降解菌,塑料降解菌的降解率为0.33%~4.24%。9株塑料降解菌中,6株为恶臭假单胞菌(Pseudomonas putida),3株为产吲哚金黄杆菌(Chryseobacterium indologenes),恶臭假单胞菌的塑料降解率高于产吲哚金黄杆菌,有进一步开发应用的潜力。China is a major producer of plastic in the world, while the use of plastic products creates a large amount of plastic waste which is difficult to be degraded. In order to obtain strains that can efficiently degrade plastics, polyethylene plastic was used as the sole carbon source to screen plastic degrading bacteria. The degradation efficiency was determined by weight-loss method, and the strains were identified by nucleic acid taxonomy based on 16S rDNA sequencing. Results: 9 plastic degrading bacteria were screened from semi degraded soil plastics, with the degradation rate of 0.33% to 4.24%. Among the 9 strains of plastic degrading bacteria, two-thirds are Pseudomonas putida and one-thirds are Chryseobacterium indologenes. The plastic degradation rate of P. putida is higher than that of C. indologenes. That indicates P. putida has the potential for further development and application.
文摘针对单端四端浮地零器(FTFN:Four-Term inal F loating Nu llor)具有不适合应用于模数混合电路的缺点,提出了一种全平衡式四端浮地零器(FBFTFN:Fu lly Balanced Four-Term inal F loating Nu llor)及CMOS(Comp le-m entaryM etal-Oxide Sem iconductor)电路实现。FBFTFN采用全平衡式结构,比单端FTFN通用性更强,应用更灵活;运用FBFTFN实现了电流模式连续时间五阶跳耦结构的滤波器。该滤波器采用5个有源元件数目,结构简单,所有电容,电阻都接地,适于全集成和模数混合电路。通过面向设计电路完成MOS管级的PSPICE(Personal S imu lation Program w ith Integrated)仿真,结果表明设计方案是可行的。
